Scarfing torch



March 1942- J. L. ANDERSON SCARFING TORCH Filed Feb. 23, 1939 R O T N EV m Patented Mar. 24, 1942 SCARFING TORCH James L. Anderson, Oloster, N.1., assignor to Air Reduction Company, Incorporated, New York, N. Y., acorporation of New York Application February 23, 1939, Serial No.257,941

14 Claims.

This invention relates to torches for removing surface metal from metalbodies by means of an oxygen jet or group of such jets directed at anacute angle against the heated surface. The process which removessurface metal in thismanner is generally known as scarfing.

One object of the invention is to provide an improved scarfing torchthat directs a number of oxygen streams against the surface of a metalbody, with the streams spaced close enough to remove the metal fromtouching or overlapping areas which preferably cover the entire width ofthe metal body.

Another object is to provide an improved hand torch with one or morebearing surfaces which are in such relation to the tip face of the torchthat when the bearing surface is resting on the metal body to bescarfed. the tip face is at the correct spacing from the metal body andthe one or more oxygen jet orifices at the desired angle to the surfaceto be scarfed.

Other features of the invention relate to preheating jet oriflces forheating the surface against which the scarfing jets are directed, and tothe supply of air to support the secondary combustion of fuel-gaspreheating flames, such as oxyacetylene flames.

With a multi-scarfing jet tip, the, preheating fiame jet orifices may bein a circle around each scarfing jet orifice, or they may extend in asemicircle either above or below the individual oxygen jets, or they maybe located entirely above or below the scarfing jets.

With embodiments of the invention in which some or all of the preheatingjets are located under the oxygen jets and the torch has a supportingbearing resting on the work, passages are provided for the entrance ofair, such as lengthwise extending grooves in the bearing face.

Other objects, features and advantages of the invention will appear orbe pointed out as the specification proceeds.

In the accompanying drawing, forming part hereof:

Fig. 1 is a side elevation of a scarfing torch embodying the invention.

Fig. 2 is an enlarged perspective view of one end of the tip shown inFig. 1.

Fig. 3 is a sectional view taken on the plane 33 in Fig. 2.

Fig. 4 is a sectional view similar to Fig. 3 but showing a modified formof the invention.

Figs. 5-9 are fragmentary front views showing different locations ofpreheating jet orifices, Figs.

'7 and 9 being views of the faces of the tips shown in Figs. 3 and 4,respectively.

The torch shown in Fig. 1 includes a handle portion made up of a largetube II and two smaller tubes l2 and I3 connected into a rigid assemblyby clamps l5 located at equally spaced points along the length of thetubes. These tubes are of such length that the operator's hands, whenholding the torch, are beyond the region of intense heat generated bythe scarfing. 4

An elongated block tip I1 is connected to the lower end of the tube II.The lower ends of the tubes l2 and I3 connect with atorch head l8through which gas from these tubes flow into a mixer l9 connectedwiththe block tip ll.

Oxygen for scarfing jets is supplied to the tip I! through the tube H,and the flow of gas in the tube II is controlled by a quick-acting valvethat is normally held closed by a spring and is moved into open positionby a lever 2| on the upper end of the handle portion of the torch.

Fuel gas, such as acetylene, and oxygen for preheating fiame jets aresupplied to the torch tip through the tubes l2 and I3. respectively, andeach of these tubes is equipped with a tum-cock 23. There are hoseconnections at the upper end of the tubes ll, I2 and I3.

The handle portion of the torch extends upward at anacute angle to theplane of the surface to be scarfed, and also extends rearwardly at anangle to the direction of intended travel of the tip so that as theoperator views the progress of the scarfing operation from above he is ashort distance back of the tip and out of the path of any molten slagthat may be deflected from the body being scarfed.

Within the block tip I 'I there are two distributing chambers 25 and 26(Fig. 3) extending lengthwise of the block. Oxygen is supplied to thelarger chamber 25 by the tube l I, and an oxy-fuel gas mixture flows tothe chamber 26 from the mixer I9.

The tip I! has an elongated face 28 and scarf ing jet orifices ,29 atspaced points along the length of the face 28. These orifices 29 are atthe ends of passages 30 leading from the distributing chamber 25 in adirection preferably normal to the plane of the face 28.

There are a plurality of preheating flame jet orifices 32 openingthrough the face 28 under the respective oxygen jet orifices 29. Thesepreheating flame jet oriflces 32 are at the ends of passages 33 leadingfrom the distributing chamber 26.

The sides of the tip block I I contiguous with the long edges of theface 2. are beveled, and a shoe I4 is attached to the lower beveled sideby screws 35. The bottom of the shoe 34 is preferably hardened or coatedwith a layer of stainless steel or hard facing material 3' that retainsits hardness even when heated by contact with the hot surface of themetal body being scarfed. The bottom surface of the shoe I4 is at suchan angle to the plane of the tip face N that the scarflng Jet passagesSI are at the desired angle to the surface of the metal body to bescarfed when the shoe 34 is resting on the metal body 31 as shown inFigs. 3 and 4. Another correlation between the tip face and the shoe I4is that the orifices in the tip face are at the correct spacing from thesurface of the metal body when the tip is supported on the metal body bythe shoe l4.

It is not necessary that the shoe 34 be separate from the tip II. Thetip can be constructed so that it has an integral portion correspondingto the shoe 34. It is not necessary that the hearing surface or surfaceson the botttom of the shoe 34 be continuous, but it is a feature of theinvention that the over-all distance from the forward to the rearwardend of the bearing surface is long enough to make any tilting of the tipeasily noticeable to the operator holding the handle portion. The longerthe bearing which supports the torch on the surface of the metal body,the more evident any tilting which raises one end of the hearing willbe. This is because the longer bearing produces a greater moment of theforce or weight which holds the tip against the metal body and thusmakes the operator holding the torch more conscious of the fact that hehas tilted the torch, in the event that at any time he does hold thehandle portion at such an angle that the tip is tilted out of theoptimal position shown in Fig. 3.

For similar reasons it is desirable that the over-all width of thehearing be of substantial extent, and in the illustrated embodiment ofthe invention the shoe 34 extends for almost the entire length of thetorch block.

Because of the relatively close spacing of the oxygen jet orifices 29,these scarflng jets form a dynamic curtain of oxygen above thepreheating flames that issue from the orifices 32. This curtain cuts offthe preheating jets from the air above them, and they do not get thenecessary oxygen from the oxygen curtain because the kinetic energy ofthe scarfing jets prevents the oxygen from reaching the flame jetsdirectly below.

In order to obtain air for supporting the secondary combustion of thepreheating flames, passages are provided in the shoe 34. Figs. 1-3 showthe shoe 34 with parallel grooves 38 in its bottom face. These passagescan be formed by similar grooves in the top face of the shoe, byopenings through the shoe, or by a clearance between the shoe 34 and thetip block i1.

Air is aspirated through the grooves or passages 38 by the preheatingflame jets that issue from the orifices 32. It is not necessary that thegrooves 38 extend in the direction shown in Figs. 1-3. These airpassages may be angularly disposed, but it is a feature of the inventionthat they extend in a direction that has a component extending in thedirection of the intended movement of the torch, so that air behind oron the sides of the torch can be aspirated into the space in front ofthe tip and under the curtain of oxygen formed by the scarfing jets.

Fig. 4 shows a torch tip 40 which has preheating flame Jet orifices 4!above the scarfins' oxygen jets instead of below. An oxy-fuel gasmixture, such as an oxyacetylene mixture, is supplied to the orifices 4|from a distributing chamber 42 through passages 43. The remainder of thetip 40 is similar to the tip ll shown in Figs. 1-3 and the samereference characters are used to indicate the corresponding parts.

, The jet passages 43 being located further above the surface of themetal body in the tip 40 (Fig. 4) than in the tip ll (Fig. 3) can bedirected downward at a steeper angle toward the surface to be scarfed.

Fig. 5 shows a circle of preheating flame jet orifices 45 around each ofthe scarring oxygen Jets 2!. F18. 6 shows flame Jet orifices 46 locatedbelow the scarfing Jets and in a semicircle. The face of tip i1 is shownin Fig. 7. The preheating jet orifices 32 are shown located along shortarcs below the scarilng jet orifices 29, but these preheating jetorifices may be located along a straight line.

Fig. 8 shows a semicircle of preheating flame jet orifices 48 locatedabove each of the scarfing jet orifices 29.

The preferred embodiment and some modifications of the invention havebeen illustrated and described, but other modifications can be made andsome features of the invention can be used without others.

I claim:

1. In a scarfing torch, a tip and a number of orifices in said tip fromwhich oxygen jets are directed against a metal body to remove surfacemetal from the body, said orifices being spaced transversely of thedirection of intended movement of the torch with respect to the metalbody to be scarfed, said tip having a conduit through which oxygen issupplied to said orifices, and having other orifices from which fuel gasflame iets issue to preheat the metal surface to be scarfed,substantially all of said other orifices being located under the oxygenjet orifices, and a bearing on the torch for supporting said torch onthe work.

2. A scarfing torch comprising a block tip with an elongated face and arow of Jet orifices in said face for directing scarfing streams ofoxygen against the surface of a metal body, and supporting hearings on aside of the block at spaced regions along the length of the block forsupporting the tip on the metal body in a definite relation to thesurface of said metal body.

3. A scarfing torch comprising a block tip with an elongated face and arow of jet orifices in said face for directing scarfing streams ofoxygen against the surface of a metal body, a supporting bearing on theside of the torch, and air passages in the supporting bearing extendingin a direction to supply air to the region under the face of the tipwhen said tip is in working relation to the metal body to be scarfed andthe supporting bearing is resting on the surface of said metal body.

4. A scarflng torch comprising an elongated block tip with a face and arow of scarfing jet orifices opening through the face at spaced regionsalong the length of the face, a bearing surface on the side of the tipat an angle to the plane of the tip face, said angle being thesupplement of the angle that the plane of the tip ace makes with thesurface of a metal body when the tip is in operating position on saidmetal body, and parallel grooves in the bearing surface extending acrosssaid surface to the edge of the bearing nearest the face of the tip.

5. In a hand scarfing torch with a plurality of orifices from whichoxygen jets are directed against the surface of a metal body to bescarfed. means for guiding an operator in maintaining the torch in agiven position with respect to the work, said means comprising a shoeattached to the torch and having a plane face in position to contactwith an area of the surface of the metal body when the torch is disposedat an acute angle to the metal body and the orifices are at apredetermined spacing and angle with respect to the surface of the metalbody, said shoe having a hardened bearing surface on the bottomconstructed of material that retains its hardness and wear resistance atthe temperature encountered on the heated surface behind the scarfingjets.

6. A scarfing torch comprising an elongated block with a plurality oflarge orifices opening through a face of the block for directing oxygenjets against the surface of a metal body to be scarfed, said orificesbeing spaced along the length of the block, and smaller orifices openingthrough said face of the block around each of said oxygen orifices andcommunicating with distributing passages through which fuel gas issupplied to the smaller orifices for preheating flames.

7. A'scarfing torch comprising a block tip having an elongated face witha row of orifices extending lengthwise of the face and from whichscarfing jets of oxygen are directed against the surface of a metalbody, and other orifices opening through said face and from whichpreheating fuel-gas fiame jets are directed toward the surface of themetal body, one or more of the preheating jets being located under eachof the oxygen jet orifices.

8. A scarfing torch comprising a tip having an elongated face with a rowof orifices extending lengthwise of the face and from which scarfingjets of oxygen are directed against the surface of a metal body, otherorifices substantially all of which are above the oxygen jet orificesand directed downward toward the surface to be scarfed, and passages forsupplying to said other orifices fuel gas for preheating flame jets.

9. A scarfing torch comprising a tip having an elongated face withscarfing jet orifices opening through said face for directing jets ofoxygen against the surface of a metal body, said scarfing jet orificesbeing spaced apart in a row extending lengthwise of the face, preheatingjet orifices also opening through the elongated face, substantially allof said preheating jet orifices being located on one side of the row ofscarfing jet orifices and On that side which locates the preheating jetorifices on the side of the scarfing jet orifices away from the workwhen the torch is used with its intended orientation with respect to thework. and separate passages in the tip for supplying ox gen to thescarfing jet orifices and fuel gas to the preheating jet orifices.

10. A scarfing torch comprising a block tip having an elongated face anda bearing on one side by which the torch is supported on the surface ofthe metal body to be scarfed, jet orifices opening through said face atspaced points along the length of the face for directing scarfing jetsof oxygen against, the metal body, preheating jet. orifices openingthrough the tip face under the omen jet orifices, and air passagesthrough the supporting bearing for the supply of air to the preheatingfiames under the oxygen jets.

11. In ahand torch for scarfing metal bodies, a torch tip in which areorifices for directing jets of gas against a metal body, and means forguiding an operator in maintaining the torch in a given position withrespect to the work, said means comprising a supporting bearing on thetorch, said bearing having a plane surface extending both transverselyof, and in the direc= tion of the intended movement of the torch. thesurface of said supporting bearing being at an acute angle to the jetorifices and so correlated with the jet orifices that when the bearingis in surface contact with a surface of a metal body, the jet orificesare in a predetermined angular relation for scarfing that surface of themetal body.

12. A torch comprising an elongated block tip having a face in which area number of orifices at spaced points lengthwise of the tip face andfrom which scarfing jets of oxygen are directed against a work-piece, asupporting bearing on the torch, said bearing having a surface forsupporting the torch on the workpiece the width of said bearing beingsubstantially as great as the length of the tip face, and the length ofsaid bearing at least half as great as the width, and having saidsurface so disposed with respect to the tip face that the jet orificesare at a predetermined spacing from, and inclination to, the surface tobe scarfed when the supporting bearing is in surface contact with thework-piece, and a handle connected to the tip and extending beyond theend of the tip and upward at an acute angle to the plane of the surfaceto be scarfed.

13. A torch comprising a block tip having a face in which are a numberof orifices spaced apart lengthwise of the tip and from which scarfingjets of oxygen are directed against a work-piece, a supporting bearingon the torch,

. said bearing having a plane surface area of substantial width andlength for supporting the torch 0n the work-piece, and having saidsurface so disposed with respect to the tip face that the jet orificesare at a predetermined spacing from, and inclination to. the surface tobe scarfed when said plane surface of the supporting bearing is incontact with the work-piece, and a handle connected to the tip andextending from the tip rea'rwardly at an acute angle to the direction ofintended movement of the torch.

14. A hand scarfing torch comprising an elongated block tip having aface and a plurality of oxygen jet orifices opening through said facefor delivering scarfing jets against a work-piece, said orifices beingat spaced points along the length of the tip and close enough togetherto remove surface metal from overlapping areas of the work-piece, asupporting bearing on the torch with a surface in a fixed relation tothe face of the elongated block and in such angular position withrespect to said face that when the bearing is in surface contact with anarea of the surface of a metal body the tip is in working relation tosaid body, arid a handle for moving the tip along the metal body to bescarfed.

JAIVIES L. ANDERSON.

D l S C L. A I M E R 2,277,472.-James L. Anderson, Closter, N. J.SCARFING TORCH. Patent dated March 24, 1942. Disclaimer filed September11, 1943, by the assignee, Air Reduction Company, Incorporated.

Hereby enters this disclaimer to claims 2, 3, 4, 6, 7, and 10 of saidpatent.

[Qfivi Gazette October 12, 1943.]

